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If a BEFORE trigger changes NEW.valid_at, what is the interaction with FOR PORTION OF? This commit gives a test to capture our current behavior: The trigger's change replaces the value we computed automatically, but it does not change the bounds of the temporal leftovers. This matches the behavior of MariaDB. On the other hand, DB2 rejects changing the start/end columns of a PERIOD. Since we don't have PERIODs, we can't reject the change at trigger definition time as DB2 does, but we could reject it at run time by comparing the values before and after running triggers. Author: Paul A. Jungwirth <pj@illuminatedcomputing.com> Discussion: https://www.postgresql.org/message-id/CA%2BrenyV3Cr9BvWsPeb1t8b%3DPk24apuzyGbubAEs_YsgLUTfXpg%40mail.gmail.com
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/19/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/19/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.